Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Alkylaromatics production

A technology of aromatic compounds and alkylation, applied in the direction of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of catalyst deactivation, complex and expensive reactive distillation units, etc.

Inactive Publication Date: 2007-07-04
EXXONMOBIL CHEM PAT INC +1
View PDF43 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reactive distillation units are complex and expensive, while tending to deactivate the catalyst due to the formation of ethylene oligomers

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Alkylaromatics production
  • Alkylaromatics production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] The first and fourth beds of a four-bed ethylbenzene reactor were simulated in an adiabatic fixed bed laboratory flow reactor equipped with a suitable loading of 4 grams of zeolite catalyst to facilitate the alkylation of benzene with ethylene.

[0061] The first bed liquid feed was pure benzene, while the simulated fourth bed liquid feed had the following composition:

[0062] Benzene 77.80%

[0063] Ethylbenzene 20.86%

[0064] Diethylbenzene 1.18%

[0065] Triethylbenzene 0.04%

[0066] The simulated first bed gas feed is a mixture of ethylene and ethane in a molar ratio of 65:35. The simulated operation of the first bed was performed at a temperature of 200°C, a pressure of 350 psig (2514 kPa), a WHSV of 0.68 (ethylene basis) and an aromatics:ethylene ratio of 57:1 weight basis). The ethylene conversion was 98.0%.

[0067] In one simulation, without intermediate stage ethane removal, the simulated fourth bed gas feed was a 33:67 molar mixture of ethylene and et...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
purityaaaaaaaaaa
Login to View More

Abstract

A process is disclosed for producing an alkylaromatic compound by reacting an alkylatable aromatic compound with a feed comprising an alkene and an alkane in a multistage reaction system comprising at least first and second series-connected alkylation reaction zones each containing an alkylation catalyst. At least the first alkylation reaction zone is operated under conditions of temperature and pressure effective to cause alkylation of the aromatic compound with the alkene in the presence of the alkylation catalyst, the temperature and pressure being such that the aromatic compound is partly in the vapor phase and partly in the liquid phase. An effluent comprising the alkylaromatic compound, unreacted alkylatable aromatic compound, any unreacted alkene and the alkane is withdrawn from the first alkylation reaction zone and at least part of the alkane is removed from the effluent to produce an alkane-depleted effluent. The alkane depleted effluent is then supplied to the second alkylation reaction zone.

Description

technical field [0001] This invention relates to a process for the production of alkylaromatics, especially ethylbenzene. Background technique [0002] Ethylbenzene is an important raw material for the production of styrene, which is produced by the reaction of ethylene and benzene in the presence of an acid catalyst. Older ethylbenzene production units (generally built before 1980) use AlCl 3 or BF 3 as an acid catalyst. Newer units are commonly converted to zeolite-based acid catalysts. [0003] Commercial ethylbenzene production processes typically require the use of polymer grade ethylene having a purity in excess of 99.9 mol%. However, purification of ethylene streams to polymer grade is an expensive process, so it is of particular interest to develop processes that can operate with lower grade ethylene streams. One such source of ethylene is dilute ethylene obtained as tail gas from a fluid catalytic cracking or steam cracking unit of a petroleum refinery, which t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/66C07C6/12
CPCC07C2/66C07C6/126C07C15/073C07C2/64C07C15/067
Inventor M·C·克拉克C·M·史密斯R·J·斯米尼B·玛尔兹
Owner EXXONMOBIL CHEM PAT INC
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com